Accelerating device



May 5, 1925.

0. GL NORTON AGCELERATING DEVICE Filed April 12-, 1924 FIG. 2

FIG. 3

FIG. 1

GLIVEIR G. NORTGN INVENTOR.

A TTORNEY.

Patented May 5, 1925 UNITED STATES PATENT OFFICE.

OLIVER G. NORTON, OF DETROIT, MICHIGAN, AS-SIGNORTO' GEORGE M. HOLLEY, OF DETROIT, MIGHIGANZ.

ACCELERATING DEVICE.

Application filed April 12, 1924. Serial N0. 706,008.

To all whom it may concern:

lie it known that I, Omvnn G. NORTON, a citizen of the United States, residing at 2923 Second Blvd, Detroit, in the county of \Vayne and State of Michigan, have invented certain new and useful Improvements in Accelerating Devices, of which the following is a specification.

The object of this invention is to provide means whereby a gradual discharge of an extra supplyof fuel is obtained when the throttle is opened suddenly.

Figure 1 shows a cross sectional elevation showing the elements of a carburetor arranged in one plane for the purposes of illustration. Obviously the parts may be arranged more advantageously.

Figure 2 is a partial end elevation of the operating means.

Figure 3 is a partial elevation showing a modification of the accelerating device illustrated in- Figure 1.

In Figure 1, A is the air entrance, B is the venturi which forms the mixing chamber, C is the throttle controlling the mixture outlet D. E is the fuel 'nozzle discharging into the throat of the Venturi B. F is the master metering orifice controlling the fuel discharged through the nozzle vE and also controlling the flow of fuel through the slow speed orifice G and the low speed fuel passage H, which discharges into the mixture outlet D adjacent to and in advance of the throttle valve I is a float maintaining the fuel level in the float chamber Jv at the level Z-Z. v The above elements are the elements of a well known carbureter of the type corresponding to the J oufl'ret & Renee Patent, #1,002,700.

'- this invention, are as follows A forked arm K which is rigidly connected with the throttle C engages with the rod L provided with a sl'iitable head. This rod L is threaded into a piston M which reciprocates in a cylinder N. The head of the rod L is caused to engage with the forked arm K by means of the compression spring 0, the upper end of which engages with the perforated cap P. The cylinder N communicates with the float chamber J through the passages R R The passage B being lo- I cated at the fuel level'Z-Z, the passage R being located below the piston M when the The accelerating means which constitute piston M is in its upper aosition. The lower portion of the cylinder l\ communicates with inder a, and draws fuel from the fuel supply chamber y through the passage 1*. A

check valve on is provided in the passage r where it delivers into the cylindern. s is the delivery passage from the cylinder 11. to the accelerating outlet not shown.

Operation.Describing the operation of the Figure 1, which shows the piston M in its upper position, when the throttle valve is opened quickly the piston M descends in the cylinder N under the action of the spring 0, which is'compressed"whenever the throttle C is closed. Thus the rate of descent; of

M is independent of the rate of-o-pening of I the throttle The liquid fuel below M is trapped in N when the piston M passes R?) The fuel is compressed and therefore forced up the passage S and the'check valve Tjis'; closed. The accelerating fuel then passes past the check valve and out of the faec'ele'rating nozzle \V into the iair entrance/A, from job where it is drawn into the Venturishaped mixture chamber 13.

The function and purpose of the check valve T is as follows v When the throttle, valve is opened very slowly the piston M descends at such a rate that the flow of fuel up S will not raise the check valve '1 from its seat, In this case fuel flows up S, past T, throigh B, and back into N, which of course comn'iunicates with the float chamber J through the passage R located at the fuel. level Z-Z. It therefore happens that when the throttle valve is opened slowly little or no fuel is discharged through \V, it having been found that under such circumstances accelerating fuel is not only unnecessary but a serious detriment to the smooth operation of the engine. On the other hand when the throttle is opened quickly the maximum amount of accelerating fuel which the device is capable of giv- *W and through the cap P, down S, into cylinder N. To avoid the accelerating pump becoming air bound it is necessary to ensure that fuel will flow through B into N and it is for this purpose that the passage U is provided, v

In Figure 3 a modification of the above device is shown which-operates as follows Instead of a bypass or leak U the check valve w is provided in the passage 9, which connects the cylinder'n with the float chamber j. With this exception the'operation of the device is as that described above. That is to say, when the throttle valve is opened the piston m descends under the action of the spring 0, fuel is ejected from the cylinder n through the passage s to the accelerating nozzle not shown.

What I claim is:

1. In combination with a throttle con: trolled carbureter, an accelerating device comprising spring operated fuel pumping means and means actuated by the throttle for storing energy in the spring during the closure of the throttle, and means for disconnecting the pumping means from the throttle valve on opening the throttle, whereby fuel is gradually discharged from the pumping means to the carbur'eter immediately after the throttle is opened.

2. In combination with a throttle controlled carbureter, accelerating means comprising a spring operated pumping means, means actuated by the throttle for compressing the said spring, means for releasing the compressed spring when the throttle is quickly opened, whereby the spring pumping means gradually discharges under the action of said compressed spring.

In testimony whereof I afix my signature.

OLIVER G. NORTON. 

